Waste-heat boiler system



Oct. 16; 1928;

1,687,740 H. B. sMm-l WASTE HEAT BOILER SYSTEM Filed Feb. 9. 1922 2Sheets-Shet 1 EN T0 A TTORNEYS.

Oct. 16, 1928.

1,687,740 H. B. SMITH WASTE HEAT BOILER SYSTEM Filed Pep. 9. 1922 2sheets-sheet 2 INVENToR.

A TTORNEYS.

a boilers maybe sup i Patented Oct. 16, 1928.

Henman nesivurnforf riiainrinwgwnnw Essex-rs reifen To TQ @l 7 IWASTE-HEAT' :Benina ss'mnir;

1 Application kfile i Felpiuaryf` `9., p i

present in 'il'enti vforlopera inA V:am boi of ind ruriiacesT aiteniplat an ar,angelnent`r by-` which the heated eases su bol'ied tosuch Waste heat separately-fired Y l finely/ dividedgfuclyk such `aspowdered coal; oil'or gas. M f

`lVhere the gases if y u o v are utilized forthe generation of steam, it

ini industrial furnaces :feines toeyste is( u by the Waste heat`partic'u'larly con-l sometimes occurs that, because of variations inthe 'supply of'fuchfwastegases or variations in the deni'a boilers` thetivo "devices "arei out of' 'balance,A

` y'-1 u' f wji/ if L so that the desired amount of steaml will not ndsfor steainf from such y' always be available. Heretofoie,'it hadbeen thepractice in such casetoyhavelanwinde" j pendent boiler and a furnacedirectly conlnected thereto which may be utilized yto boost the steamsupply When the latter falls of?? either because ofincreased demands, orbecause lof lach ofsufiicient Waste gases for that purpose. Such"anarrangement7 however7 is inconvenient and expensive to operate. o Bymy present invention, l provide a separately-fired furnace which Willsupplyy addi-y tional heated gases as desired to the flue by uf'asteheat gases' from-a plurality of indus*V trial furnaces and also 'from aseparatelyiired furnace; Fig. 2 is a section of F ig. 1

outhe line 2-2 of Fig. 1;; Fig. 3 is sec- "y tion of Fig. 1 on the line3 3 of Fig. 1. and

y Fig. d is a section on the line 4e of Fig.v 1.`

Like reference characters indicate likeA parts 'in the several views. v

ln the illustrative arrangement, the waste heat boilers 10 are connectedto a distributing flue 11, to one end of which is connected a collectingflue 12, .the flues 11 and 12 constituting, in effect, a singleflue.A'plurality of cement kilns 13 areconnected to the kilns!` bei ,Dampers'16y jure provided t0n close l, entrance to the ystaclrs 41.5, andydainpeifsf-Ly17 yare ,ar-

Byfthisa' y ement, the kilns 1.3 inav el tiveeinthe flue 11 andeaehyofxthewaste heat ``l oilersf105`jso;y tliatthepassage ofgasesbe-.gli l tweenthe'fiuefll and theseveral:boilers 10 from'tlie'lllue"12.lri'ftlie illustrative form, dust pockets are provided beneath thevarious flues and the bottoms of these [pockets are connected bysuitable pipes through Which the dust collected in these pockets may becarried to any desired point.' i

rdinarily the system Will be devisedso that the Waste gases from theindustrial furnaces Will-` supply suflicientheat to the boilers 10 toprovide the normal amountof vsteam required. If7 however, through thecutting out ofy my one of the industrial furnacesj or through anincreased demand for steam, the waste heat from these industrial furnaceis insufii'cient to give the required amount of steam, then the furnace18 vvill be thrown into operation and the heated gasestherefromwillenter theoflue 12 and vmingle With the gases from theindustrial furnaces `which are passing to the `boilers 10. I While thegases from the furnace 1S may be supplied at any point in the line madeup" ofthe two parts v11 and v12,1 preferably locate theV separatelydiredfurnace so that the gases therefrom will enter the flue 11 at apointbeyond the pointof `entrance of the gases Vfrein the industrialfurnaces,1or, in other:` y

Words, i l arrange the `industrial furnace so that the gases therefromwill enter the flue' at Aa point between theupoint ofhentrance oftlielieated gases from .the furnace chamber 18 andthe boilers. By :thisarrangement,

the gases'from the separately-fired furnace will be mingled With thegases from the industrial furnaces, and thereby provide a more uniformsupply of heat to the boilers than d might be the case if theseparately-fired kfurnace Were located, say, for instance,.at the end ofthe distributing fluey 11.

l By using a furnace burning nely divided fuel, the necessity formaintaining abanked i fire, as Willbe necessary if solid fuel Wereused,H is avoided, and obviouslyv the additional heat required can besupplied much".A

more quickly than would be possible Vwith such banked fires. Vhen the=`separately- Y fired furnace 1 8 is not in use, the damper -20 maybeclosed to Vprevent ythe'entran'ce of cold air into theflue 12. y e vBy'providing a plurality of industrial fur-y naces and a plurality ofWastelieat boilers 'y connected thereto, with asingle separately-r'f'fr'ed furnace, 'a system of great flexibility is obtainediwith aminimum expense. s In'such an arrangement, any one 0f the boilers or anyone of the industrial furnaces may be cut-out and-yet the'system'willnot be unbalanced, b e-` rat'ely-ired furnace can be put intocommislsion to supply the necessary amount-of heat tof compensa-te forthe amount of heat that would ordinarily be derived from suchindustrial'.

furnace." On the othe'rhand, if one ofthe boilersiis cut out, then itmaybe desirable to operaterwith the gas at a higher temperature i thanwould be derived vfrom the industrial furnace alone, in Whichscasevalso,suchV ad-V ditional heat may be obtained from theseparately-firedrfurnace.

nection with cement kilns, it will be understood that any otherform ofindustrial furnace may be used. Similarly, While I have .illustrated theWaste heat boiler of the type 'shown in the patent to Bell N o.1,332,284, it

'While Ihave illustrated mysystem in'cony will be understood that'anyother forni of' d rWaste heat boiler may be used. I claim In asystem'forutilizing the Waste heat from industriall furnaces, a steamboiler,a separately-fired furnace adapted to burn iinelydivided fuel, along` flue connecting said furnace to said boilerand 'a-plurality of kindustrial furnaces., each connected to saidA flue withy the ypoints ofconnection spacedy y along theiiue, wherebyy the hot Waste gases fromfall y.of the industrial'furnaces are del liveredy to the fluebetweenits connection yto saidboiler'and its connection to saidseparately-red furnace.

HERMAN n.y SMITH., y

